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Table 1 Environmental findings from the workplace of Case A, plant A

From: Two Legionnaires' disease cases associated with industrial waste water treatment plants: a case report

Date (before or after infection) Water systems sampled (sample type) Temperature (°C) Legionella concentration (cfu/l) Type of Legionella
28 th Feb 2006 (before) Active sludge basin at the waste water treatment plant (water) 33.0 2.0 × 107 L. pneumophila serogroup 13
28 th Feb 2006 (before) Circulating waste water at the waste water treatment plant (water) 35.0 1.0 × 104 L. pneumophila serogroup 3
29 th Aug 2006 (after) Active sludge basin at the waste water treatment plant (water) 36.0 1.0 × 106 L. pneumophila serogroup 1
29 th Aug 2006 (after) Post-clarification basin at the waste water treatment plant (water) 35.0 2.3 × 104 L. pneumophila serogroup 1, subgroup Bellingham
29 th Aug 2006 (after) Post-clarification basin at the waste water treatment plant (sludge) 36.0 2.0 × 106 and 1.0 × 106 L. pneumophila serogroup 1, subgroup Bellingham and L. pneumophila serogroup 13